Remove PvNode template from reduction
This functional simplification removes the PvNode reduction and adjusts the ttPv lmr condition accordingly. Their definitions only differ by the inclusions of ttPv. Aside from this, shallow move pruning definition will be the only other functional difference, but this does not seem to matter too much. STC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 58908 W: 12980 L: 12932 D: 32996 http://tests.stockfishchess.org/tests/view/5cd1aaaa0ebc5925cf046c6a LTC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 20351 W: 3521 L: 3399 D: 13431 http://tests.stockfishchess.org/tests/view/5cd23fa70ebc5925cf047cd2 Bench: 3687854pull/2056/head
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@ -70,9 +70,9 @@ namespace {
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// Reductions lookup table, initialized at startup
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int Reductions[MAX_MOVES]; // [depth or moveNumber]
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template <bool PvNode> Depth reduction(bool i, Depth d, int mn) {
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Depth reduction(bool i, Depth d, int mn) {
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int r = Reductions[d / ONE_PLY] * Reductions[mn] / 1024;
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return ((r + 512) / 1024 + (!i && r > 1024) - PvNode) * ONE_PLY;
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return ((r + 512) / 1024 + (!i && r > 1024)) * ONE_PLY;
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}
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constexpr int futility_move_count(bool improving, int depth) {
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@ -964,7 +964,7 @@ moves_loop: // When in check, search starts from here
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continue;
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// Reduced depth of the next LMR search
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int lmrDepth = std::max(newDepth - reduction<PvNode>(improving, depth, moveCount), DEPTH_ZERO);
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int lmrDepth = std::max(newDepth - reduction(improving, depth, moveCount), DEPTH_ZERO);
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lmrDepth /= ONE_PLY;
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// Countermoves based pruning (~20 Elo)
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@ -1012,11 +1012,11 @@ moves_loop: // When in check, search starts from here
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|| moveCountPruning
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|| ss->staticEval + PieceValue[EG][pos.captured_piece()] <= alpha))
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{
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Depth r = reduction<PvNode>(improving, depth, moveCount);
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Depth r = reduction(improving, depth, moveCount);
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// Decrease reduction if position is or has been on the PV
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if (ttPv)
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r -= ONE_PLY;
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r -= 2 * ONE_PLY;
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// Decrease reduction if opponent's move count is high (~10 Elo)
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if ((ss-1)->moveCount > 15)
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